638552442 has 16 divisors (see below), whose sum is σ = 1393205472. Its totient is φ = 193500720.

The previous prime is 638552429. The next prime is 638552443. The reversal of 638552442 is 244255836.

638552442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 638552442.

It is not an unprimeable number, because it can be changed into a prime (638552443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4837453 + ... + 4837584.

It is an arithmetic number, because the mean of its divisors is an integer number (87075342).

Almost surely, 2^638552442 is an apocalyptic number.

638552442 is an abundant number, since it is smaller than the sum of its proper divisors (754653030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638552442 is a wasteful number, since it uses less digits than its factorization.

638552442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9675053.

The product of its digits is 230400, while the sum is 39.

The square root of 638552442 is about 25269.5952084714. The cubic root of 638552442 is about 861.1236628027.

The spelling of 638552442 in words is "six hundred thirty-eight million, five hundred fifty-two thousand, four hundred forty-two".